Electronic component is a general term for components and devices. Electronic components: The smallest unit in the composition of electronic products, refers to the finished products that do not change the molecular composition during the production and processing of the chip processing plant, such as resistors, capacitors and inductors. These three basic components in the electronic circuit are similar to the important pieces of "car, horse and gun" in chess. As a science and technology production "small master, in order to Gu Li electronic production, we must first be familiar with and master the structural characteristics of the three most basic components, shape types, main parameters, identification methods and circuit symbols.

Resistors, capacitors and inductors can be collectively referred to as impedance components, as the name suggests, they all have the ability to hinder "electricity", respectively emit pure impedance (resistor), capacitive reactance (capacitor) or inductive reactance (inductor) function in the circuit, which capacitors have the ability to store charge, which is characterized by allowing the flow of alternating current, prevent the flow of direct current, Inductors have the ability to store magnetic energy, and its characteristics are the opposite of capacitors, is straight, AC resistance. These two components are often used in oscillating circuits, tuning circuits, decoupling circuits and filtering circuits.

Because such electronic components work without any form of power supply inside, such components are called passive devices. Electronic devices refer to finished products that have changed their molecular structure during manufacturing, such as body tubes, electronic tubes and integrated circuits. Because electronic components work, their internal power supply exists, so called active devices. Electronic components are divided into SMT electronic components and Through Hole Technology (THT) electronic components according to their assembly methods. The passive Device used for SMT chip processing is referred to as the Surface Mount Component (SMC), and the active device is referred to as the Surface Mount device (SMD). The passive Device used in THT is referred to as the Through Hole Component (THC), and the active device is referred to as the Through Hole device (THD). It is the change of electronic components that has led to the innovation of advanced electronic products, so the history of electronic components is actually a concentrated history of electronic development.